A.\(3\,\,\,\left( {cm} \right)\).
B.\(6\,\,\,\left( {cm} \right)\). 
C.\(5\,\,\,\left( {cm} \right)\).        
D.\(4\,\,\left( {cm} \right)\) .

A.\(\left( {x;y} \right) = \left( {1; - 2} \right).\)
B.\(\left( {x;y} \right) = \left( {1; - 1} \right).\)
C.\(\left( {x;y} \right) = \left( {1;2} \right).\)
D.\(\left( {x;y} \right) = \left( {1; - 3} \right).\)

A.\(A = \sqrt x \)
B.\(A = \dfrac{{\sqrt x }}{{\sqrt x  - 3}}\)
C.\(A = \sqrt x  - 3\)
D.\(A = \dfrac{{\sqrt x  - 3}}{{\sqrt x }}\)

A.\(x =  - 4\,;\,\,x =  - 1\)
B.\(x = 4\,;\,\,x = 1\)
C.\(x = 4\,;\,\,x =  - 1\)
D.\(x =  - 4\,;\,\,x = 1\)

A.\( - 11\)
B.\(11\) và \( - 11\).
C.\(11\).                            
D.\(12\).

A.\(-5\)
B.\(15\)
C.\( - 15.\)
D.\(5\)

A.\(4{x_0} + {y_0} = 1\).
B.\(4{x_0} + {y_0} = 3\).
C.\(4{x_0} + {y_0} =  - 1\).                                   
D.\(4{x_0} + {y_0} = 5\).

A.4
B.3
C.5
D.6

A.\(0\).
B.\(2\).
C.\(5\).
D.\(4\)

A.\(\sqrt {119} \,\,\left( {cm} \right)\).
B.\(13\,\,\left( {cm} \right)\).        
C.\(17\,\,\left( {cm} \right).\)        
D.\(\sqrt 7 \,\,\left( {cm} \right)\)